landsiedel



Feb. 7, 1956 w. w. LANDSIEDEL 2,733,859

PRINT SUPPRESSION MECHANISM FOR CALCULATING MACHINES Original Filed May12, 1949 3 Sheets-Sheet 1 INVENTOR W. LANDSlEw l l I...!

1956 w. w. LANDSIEDEL 2,733,859

PRINT SUPPRESSION MECHANISM FOR CALCULATING MACHINES Original Filed May12, 1949 5 Sheets-Sheet 2 FIG.2

INVENTOR WALTER W. LAN DSIEDEL BY f MMM Feb. 7, 1956 w. w. LANDSIEDEL2,733,859

PRINT SUPPRESSION MECHANISM FOR CALCULATING MACHINES Origmal Filed May12, 1949 SSheets-Sheet 3 FIG.3 F|G.4

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468790 4687900000 l 3750 I 3750000000 2 3750 2 375000000 5 3750 537500000 0 3750 0 3750000 ggg 1 375000 0 37500 6 3750 6 3750 FIG.5 FIG.6

NVVMNWAANWWNVMNVWWMWWVWAWAA an INVENTOR WALTER W LANDSIEDE BYMZATTORNEYS United States Patent Oflice 2,733,859 Patented Feb. 7, 1956PRINT SUPPRESSION MECHANISM FOR CALCULATING MACHINES Walter W.Landsiedel, deceased, late of Elmira, N. Y., by Florence E. Landsiedel,executrix, Cincinnati, Ohio, assignor, by mesne assignments, to SperryRand Corporation, New York, N. Y., a corporation of Delaware Originalapplication May 12, 1949, Serial No. 92,814. Divided and thisapplication September 2, 1953, Serial No. 378,151

4 Claims. (Cl. 235-60) This invention relates to calculating machineswherein addition, subtraction, division, regular multiplication shortcut and discount multiplication problems may be performed, and hasespecial reference to means whereby the essential factors of suchproblems may be printed without the printing of unnecessary zeros.

The particular machine wherein the invention is embodied is animprovement on the machine disclosed in Patent 2,688,439, issuedSeptember 7, 1954, to Walter W. Landsiedel and entitled Decimal PointMechanism, and it further improves upon the machines set forth inearlier Patents Nos. 1,899,444, 2,203,336, 2,229,980, 2,237,881, and2,255,622.

This application is a division of application Serial Number 92,814entitled Adding and Computing Machines, filed May 12, 1949, by Walter W.Landsiedel, deceased, the inventor herein, and relates more particularlyto mechanism herein for eliminating the printing of unnecessary zeros,particularly in multiplication and division problems.

In earlier machines, zeros required for spacing in the setting up ofmultiplication and division problems, were printed along with thefactors of the problem on the tally sheet. The present machine does notprint these zeros in either a multiplication or division problem. Thisis brought about by adding an extra row of space stops. These are usedin place of the zeros formerly employed in the setting up of suchproblems. A row of these space stops has been added in front of the zerostops in the stop section of the machine. Novel mechanism cooperatingwith the adding racks and the space stops blocks the firing of the printhammers when the space stops are depressed. These stops are depressed bya space key and may be set up individually or by depressing the spacekey and a constant key simultaneously.

The object of this invention therefore is to provide a printingcalculating machine in which there is means for preventing the printingof insignificant zeros, such as have been used in indexing inmultiplication and division problems.

In brief and general terms, the invention herein is characterized by thecombination of a print hammer, means for blocking the effective firingof said hammer, movable means to control the movement of the blockingmeans, and settable stop members to control the degree of movement ofsaid control means.

More particularly there is provided a print hammer which is released inthe cycle of operations to print; there is a blocking element,spring-urged to effective blocking or unblocking position to prevent orpermit the effective firing of the hammer; there is an adding rack unitprovided with means, as the rack is moved rearward in the machine, tocontrol the rearward movement of the blocking element; and there is aseries of stops, operator manipulated, to regulate the degree ofmovement of the adding rack, one of said stops permitting the blockingelement to move to blocking position, and the otherstops permitting themovement of the blocking element to unblocking position.

A preferred present form which the invention may assume is illustratedin the drawing, in which Fig. 1 is a front to rear vertical sectionthrough the machine taken inside the right inner frame of the machineand showing certain basic features of the machine illustrating generallythe location in the machine of the features of the invention;

Fig. 2 is a detailed perspective view of the zero nonprint mechanism ofthe invention;

Fig. 3 represents a section of a tally sheet containing printed thereona problem in division as performed and recorded on the machine of thepresent invention and involving the non-print of insignificant zeros;

Fig. 4 shows the same problem as in Fig. 3 as performed and recorded ona machine not having the novel mechanism for the non-printing ofinsignificant zeros;

Fig. 5 represents a section of a tally sheet containing printed thereona problem in multiplication as performed and recorded on the machine ofthe present invention and showing the non-print of insignificant zeros;and,

Fig. 6 shows the same problem as in Fig. 5 as performed and recorded ona machine not having the novel mechanism for the non-printing ofinsignificant zeros.

The correspondence between the figures in this application and those ofthe parent application is as follows:

Present Ap- Parent Application plication Fig. 1 Fig. 8 Fig. 2 Fig. 12Fig. 3 Fig. 13 Fig. 4 Fig. 14 Fig. 5 Fig. 15 Fig. 6 Fig. 16

Referring now merely to the specific form of the invention shown in thedrawings, it is to be noted that in Fig. 1 a general section through themachine is illustrated and shows the stop carriage 10, in which iscontained a group of stop pins 11 which are depressed or set by thestems 12 of digit keys 13 and provided with space stop pins 14 settableby means of the stems 15 of space stop key 16. The carriage 10 in normalinactive position is disposed at the right of machine so as to place theextreme left hand or highest order column of stop pins beneath the keystems; The carriage is tensioned to the left by spring means and escapedstep by step by Y any suitable means each time a digit key 13 or a spacestop key 16 is depressed and this action places a new column of pinsbeneath the key stems. Limited in the extent of their movement by thestop pins, which are set up by depression of the digit key or space key,are adding racks 17 located for longitudinal movement beneath the pincarriage 10. Each of these racks 17 is connected by pin 18 and slot 19to an associated slide 28 formed with an upturned heel 21. These slidesare held in their normal or forward position against the tension of aspring 22 by means of a bail rod 23 which is cam controlled as shown inFigs. 1, 4, and 6 of Patent No. 2,229,980 through arm 334, roller 331,and earn 315 of that patent. Each time the machine is cycled, the bailrod 23 moves rearwardly releasing and permitting the slides 20, andtheir associated racks 17, to follow upon the pull of spring 22 untiltheir heels 21 limit against any stops 11 or 14 set up in the path ofthe heels of the respective slides. From Fig. 1 it will be noted thatthe space stop pins 14 are disposed in each column in front of all theother pins 11 which represent values from 0 to 9 inclusive, so thatWhen-a space stop pin is depressed the racks cannot move to set the typeracks to print any number. The purpose of the space stops is not only toindex a space behind a figure entered into the pin carriage, butprimarily to prevent the customary printing of insignificant zeros whichwould occur were it not for such space stops. Novel mechanism about tobe described, associated with each of the several adding racks, preventssuch zero printing in those columns wherein space stops have beenactuated.

Referring now to the drawings, and particularly to Fig ure 2, there isshown one of the several adding racks 17 with its associated novel zeronon-printing mechanism. Limited by its shoulder 24 against the ear 25 ofa slide 2t), is a rearwardly extending hammer blocking link 26 having aslot 27 at its forward end for guidance on a fixed cross bar 28.Projecting up from the rear of the link 26 is a type-hammer block arm29. The link 26 is guided for longitudinal sliding movement by a tall 36at its rear end slidable in a suitable slot in a fixed member 31. An ear32 on the projecting hammer-block arm 29, when positioned in theclockwise path of movement of the type hammer toe 33, serves to blockeffective firing of the type hammer 34 and thereby prevents printing.

It will be seen that on the rearward stroke of the mech anism after aspace stop 14 has been set up in the stop carriage 10, that therack-carrying slide 20, under tension of its spring 22, moves rearwarduntil stopped when its heel. 2i limits against the set-up space stop.The slide in sliding rearward removes its limiting ear from the shoulder24, whereupon the hammer block link 26, tensioned by its spring 26', isdrawn rearward to a position wherein the block arm ear 32 is disposedunder the print hammer toe 33 to prevent effective firing of the hammer.Upon the setting of any stop 11 rearwardly of the space stops 14, thehammer blocking link 26 will be permitted to move rearwardlysulficiently to carry the block arm car 32 out of the path of the printhammer toe 33 and thereby permit effective hammer firing.

Now, to illustrate what occurs on a tally sheet where printing isprevented after space stops instead of zero stops have been indexedbehind a figure entered into the pin carriage, reference is made toFigs. 3 and 5 showing, respectively, printed examples of a division anda multiplication problem performed on a machine where space stops andzero non-print mechanism is incorporated, and to Figs. 4 and 6 showing,respectively, printed examples of the same problems performed on amachine not having such improved mechanism.

The division problem (Fig. 3) is set up as follows:

In the machine having the zero non-print mechanism, the

dividend 468,790 is first entered into the pin stop carriage in theusual manner. The space key is then depressed four times, setting upfour space stops, and the dividend so indexed is entered into theaccumulator.

Next the divisor 3750 is set up and the space key is depressed six timessetting up six space stops to locate the divisor directly under 4687 ofthe dividend. In a machine not having the space stop and associated zeronon-print mechanism, zero stops are indexed in lieu of space stops insetting up the dividend and the divisor.

The multiplication problem (Fig. 5) is set up as follows: In the machinewith the Zero non-print mechanism the multiplicand 37520 is firstentered into the pin stop carriage. The space key is depressed threetimes setting up three space stops. In a machine not having the spacestop and associated Zero non-print mechanism, zero stops are indexed inlieu of space stops in setting up the problem.

It will be noted from Figs. 4 and 6, in the cases where the zero stopshave been indexed, that such insignificant zeros have been printed inthe performance of the problem, whereas in the examples in Figs. 3 and5, where the space stops have been indexed, such insignificant zeroswere not printed.

While having described what is considered to be a hightit) til

ly desirable embodiment of the invention in this case, it is obviousthat many changes in form could be made Without departing from thespirit of the invention, which is, therefore, not limited to the exactform herein shown and described, nor to anything less than the whole ofthe invention as hereinbefore set forth, and as hereinafter claimed.

What is claimed is:

1. In a machine of the class described, a print hammer released to printin the cycle of operations, a blocking element for the print hammer, aspring to urge said blocking element to blocking or unblocking positionto prevent or permit the effective firing of the hammer, an adding rackunit, means associated with said unit as it is moved rearward in themachine to control the rearward movement of the blocking element, and astop carriage having key operated stop pins to regulate the degree ofmovement of the rack unit, one of said stop pins permitting the rack soto move that the blocking element moves to blocking position, andanother of said stop pins permitting the rack so to move that theblocking element moves to nnblocking position.

2. In a machine of the class described, the combination of printhammers, means for blocking effective firing of said hammers, an addingrack associated with and controlling the movement of said blockingmeans, a stop carriage, key operated space stops settable in suchcarriage for limiting movement of said blocking means to hammer blockingposition, and key operated digit stops settable in said carriage forallowing movement of said blocking means beyond hammer blocking positionto enable effective hammer firing.

3. In a machine of the class described, the combination of mainoperating means, adding racks and racks carrying type elements, printhammers operable by the main operating means for striking the typeelements, print hammer blocking means associated with the adding racks,said adding racks being rcarwardly movable by the main operating meansand controlling the movement of the blocking means to and out ofblocking position, a stop carriage, space stops settable in saidcarriage for limiting the rearward movement of the adding racks wherebyon the limited movement allowed by the space stops the blocking means ispermitted to move to harnmer blocking position, and digit stops settablein the carriage for allowing movement of the adding racks beyond thespace stops whereby the blocking means is permitted to move beyondhammer blocking position.

4. In a machine of the class described, a print hammer having a toe andadapted to be swung rearwardly to print, main operatnig means forreleasing the hammer for printing operations, a blocking link having ablocking ear to be disposed in the path of the hammer toe, a spring forurging the link rear'wardly, an adding rack unit including a slide andadapted to have a normal forward position, an ear on said slide blockingthe rearward movement of the link when the slide is in its forwardposition, said rack unit being moved rearwardly by the operation of themain operating means, a pin stop car riage having digit stop pins andspace stop pins adapted to be manually depressed, a heel on the slide toengage said stop pins to control the rearward movement of the slide, thespace stop pins positioned to permit the rack unit to move rearwardly todispose the blocking element in the path of the toe of the hammer, thedigit stop pins positioned to permit the rack unit to move rearwardly todispose the blocking element beyond the toe of the hammer and therebypermit effective firing of the hammer.

Landsiedel Oct. 25, 1921 Sundstrand Nov. 19, 1935

